]>
Commit | Line | Data |
---|---|---|
6b473aca | 1 | /* |
3c7d0945 | 2 | * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved. |
6b473aca MC |
3 | * |
4 | * Licensed under the OpenSSL license (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
f6370040 | 10 | #include <string.h> |
677963e5 | 11 | #include "internal/nelem.h" |
88050dd1 | 12 | #include "internal/cryptlib.h" |
6b473aca MC |
13 | #include "../ssl_locl.h" |
14 | #include "statem_locl.h" | |
15 | ||
f63a17d6 | 16 | static int final_renegotiate(SSL *s, unsigned int context, int sent); |
1266eefd | 17 | static int init_server_name(SSL *s, unsigned int context); |
f63a17d6 | 18 | static int final_server_name(SSL *s, unsigned int context, int sent); |
332eb390 | 19 | #ifndef OPENSSL_NO_EC |
f63a17d6 | 20 | static int final_ec_pt_formats(SSL *s, unsigned int context, int sent); |
332eb390 | 21 | #endif |
1266eefd | 22 | static int init_session_ticket(SSL *s, unsigned int context); |
8f8c11d8 | 23 | #ifndef OPENSSL_NO_OCSP |
1266eefd | 24 | static int init_status_request(SSL *s, unsigned int context); |
8f8c11d8 | 25 | #endif |
805a2e9e | 26 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1266eefd | 27 | static int init_npn(SSL *s, unsigned int context); |
805a2e9e | 28 | #endif |
1266eefd | 29 | static int init_alpn(SSL *s, unsigned int context); |
f63a17d6 | 30 | static int final_alpn(SSL *s, unsigned int context, int sent); |
1266eefd | 31 | static int init_sig_algs(SSL *s, unsigned int context); |
45615c5f | 32 | static int init_certificate_authorities(SSL *s, unsigned int context); |
b186a592 MC |
33 | static EXT_RETURN tls_construct_certificate_authorities(SSL *s, WPACKET *pkt, |
34 | unsigned int context, | |
35 | X509 *x, | |
f63a17d6 | 36 | size_t chainidx); |
45615c5f DSH |
37 | static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt, |
38 | unsigned int context, X509 *x, | |
f63a17d6 | 39 | size_t chainidx); |
805a2e9e | 40 | #ifndef OPENSSL_NO_SRP |
1266eefd | 41 | static int init_srp(SSL *s, unsigned int context); |
805a2e9e | 42 | #endif |
1266eefd MC |
43 | static int init_etm(SSL *s, unsigned int context); |
44 | static int init_ems(SSL *s, unsigned int context); | |
f63a17d6 | 45 | static int final_ems(SSL *s, unsigned int context, int sent); |
b2f7e8c0 | 46 | static int init_psk_kex_modes(SSL *s, unsigned int context); |
deb2d5e7 | 47 | #ifndef OPENSSL_NO_EC |
f63a17d6 | 48 | static int final_key_share(SSL *s, unsigned int context, int sent); |
deb2d5e7 | 49 | #endif |
805a2e9e | 50 | #ifndef OPENSSL_NO_SRTP |
1266eefd | 51 | static int init_srtp(SSL *s, unsigned int context); |
805a2e9e | 52 | #endif |
f63a17d6 MC |
53 | static int final_sig_algs(SSL *s, unsigned int context, int sent); |
54 | static int final_early_data(SSL *s, unsigned int context, int sent); | |
55 | static int final_maxfragmentlen(SSL *s, unsigned int context, int sent); | |
805a2e9e | 56 | |
70af3d8e | 57 | /* Structure to define a built-in extension */ |
1266eefd MC |
58 | typedef struct extensions_definition_st { |
59 | /* The defined type for the extension */ | |
6b473aca | 60 | unsigned int type; |
1266eefd MC |
61 | /* |
62 | * The context that this extension applies to, e.g. what messages and | |
63 | * protocol versions | |
64 | */ | |
65 | unsigned int context; | |
68db4dda | 66 | /* |
805a2e9e MC |
67 | * Initialise extension before parsing. Always called for relevant contexts |
68 | * even if extension not present | |
68db4dda | 69 | */ |
1266eefd MC |
70 | int (*init)(SSL *s, unsigned int context); |
71 | /* Parse extension sent from client to server */ | |
61138358 | 72 | int (*parse_ctos)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 73 | size_t chainidx); |
1266eefd | 74 | /* Parse extension send from server to client */ |
61138358 | 75 | int (*parse_stoc)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 76 | size_t chainidx); |
1266eefd | 77 | /* Construct extension sent from server to client */ |
b186a592 | 78 | EXT_RETURN (*construct_stoc)(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 79 | X509 *x, size_t chainidx); |
1266eefd | 80 | /* Construct extension sent from client to server */ |
b186a592 | 81 | EXT_RETURN (*construct_ctos)(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 82 | X509 *x, size_t chainidx); |
68db4dda | 83 | /* |
805a2e9e MC |
84 | * Finalise extension after parsing. Always called where an extensions was |
85 | * initialised even if the extension was not present. |sent| is set to 1 if | |
86 | * the extension was seen, or 0 otherwise. | |
68db4dda | 87 | */ |
f63a17d6 | 88 | int (*final)(SSL *s, unsigned int context, int sent); |
6b473aca MC |
89 | } EXTENSION_DEFINITION; |
90 | ||
4b299b8e | 91 | /* |
70af3d8e | 92 | * Definitions of all built-in extensions. NOTE: Changes in the number or order |
bd91e3c8 | 93 | * of these extensions should be mirrored with equivalent changes to the |
3e6c1da8 | 94 | * indexes ( TLSEXT_IDX_* ) defined in ssl_locl.h. |
70af3d8e MC |
95 | * Each extension has an initialiser, a client and |
96 | * server side parser and a finaliser. The initialiser is called (if the | |
97 | * extension is relevant to the given context) even if we did not see the | |
98 | * extension in the message that we received. The parser functions are only | |
99 | * called if we see the extension in the message. The finalisers are always | |
100 | * called if the initialiser was called. | |
101 | * There are also server and client side constructor functions which are always | |
102 | * called during message construction if the extension is relevant for the | |
103 | * given context. | |
104 | * The initialisation, parsing, finalisation and construction functions are | |
105 | * always called in the order defined in this list. Some extensions may depend | |
106 | * on others having been processed first, so the order of this list is | |
107 | * significant. | |
108 | * The extension context is defined by a series of flags which specify which | |
109 | * messages the extension is relevant to. These flags also specify whether the | |
3e6c1da8 | 110 | * extension is relevant to a particular protocol or protocol version. |
a1448c26 | 111 | * |
70af3d8e | 112 | * TODO(TLS1.3): Make sure we have a test to check the consistency of these |
10ed1b72 TS |
113 | * |
114 | * NOTE: WebSphere Application Server 7+ cannot handle empty extensions at | |
115 | * the end, keep these extensions before signature_algorithm. | |
4b299b8e | 116 | */ |
0785274c | 117 | #define INVALID_EXTENSION { 0x10000, 0, NULL, NULL, NULL, NULL, NULL, NULL } |
6b473aca MC |
118 | static const EXTENSION_DEFINITION ext_defs[] = { |
119 | { | |
120 | TLSEXT_TYPE_renegotiate, | |
fe874d27 MC |
121 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
122 | | SSL_EXT_SSL3_ALLOWED | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
123 | NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate, |
124 | tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate, | |
125 | final_renegotiate | |
6b473aca MC |
126 | }, |
127 | { | |
128 | TLSEXT_TYPE_server_name, | |
fe874d27 MC |
129 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
130 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd MC |
131 | init_server_name, |
132 | tls_parse_ctos_server_name, tls_parse_stoc_server_name, | |
133 | tls_construct_stoc_server_name, tls_construct_ctos_server_name, | |
134 | final_server_name | |
6b473aca | 135 | }, |
cf72c757 F |
136 | { |
137 | TLSEXT_TYPE_max_fragment_length, | |
138 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO | |
139 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
140 | NULL, tls_parse_ctos_maxfragmentlen, tls_parse_stoc_maxfragmentlen, | |
141 | tls_construct_stoc_maxfragmentlen, tls_construct_ctos_maxfragmentlen, | |
142 | final_maxfragmentlen | |
143 | }, | |
6b473aca MC |
144 | #ifndef OPENSSL_NO_SRP |
145 | { | |
146 | TLSEXT_TYPE_srp, | |
fe874d27 | 147 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY, |
1266eefd | 148 | init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL |
6b473aca | 149 | }, |
0785274c MC |
150 | #else |
151 | INVALID_EXTENSION, | |
6b473aca MC |
152 | #endif |
153 | #ifndef OPENSSL_NO_EC | |
154 | { | |
155 | TLSEXT_TYPE_ec_point_formats, | |
fe874d27 MC |
156 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
157 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
158 | NULL, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats, |
159 | tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats, | |
160 | final_ec_pt_formats | |
6b473aca MC |
161 | }, |
162 | { | |
7bc2bddb BK |
163 | /* |
164 | * "supported_groups" is spread across several specifications. | |
165 | * It was originally specified as "elliptic_curves" in RFC 4492, | |
166 | * and broadened to include named FFDH groups by RFC 7919. | |
167 | * Both RFCs 4492 and 7919 do not include a provision for the server | |
168 | * to indicate to the client the complete list of groups supported | |
169 | * by the server, with the server instead just indicating the | |
170 | * selected group for this connection in the ServerKeyExchange | |
171 | * message. TLS 1.3 adds a scheme for the server to indicate | |
172 | * to the client its list of supported groups in the | |
173 | * EncryptedExtensions message, but none of the relevant | |
174 | * specifications permit sending supported_groups in the ServerHello. | |
175 | * Nonetheless (possibly due to the close proximity to the | |
176 | * "ec_point_formats" extension, which is allowed in the ServerHello), | |
177 | * there are several servers that send this extension in the | |
178 | * ServerHello anyway. Up to and including the 1.1.0 release, | |
179 | * we did not check for the presence of nonpermitted extensions, | |
180 | * so to avoid a regression, we must permit this extension in the | |
181 | * TLS 1.2 ServerHello as well. | |
182 | * | |
183 | * Note that there is no tls_parse_stoc_supported_groups function, | |
184 | * so we do not perform any additional parsing, validation, or | |
185 | * processing on the server's group list -- this is just a minimal | |
186 | * change to preserve compatibility with these misbehaving servers. | |
187 | */ | |
6b473aca | 188 | TLSEXT_TYPE_supported_groups, |
7bc2bddb BK |
189 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS |
190 | | SSL_EXT_TLS1_2_SERVER_HELLO, | |
1266eefd | 191 | NULL, tls_parse_ctos_supported_groups, NULL, |
6af87546 | 192 | tls_construct_stoc_supported_groups, |
1266eefd | 193 | tls_construct_ctos_supported_groups, NULL |
6b473aca | 194 | }, |
0785274c MC |
195 | #else |
196 | INVALID_EXTENSION, | |
197 | INVALID_EXTENSION, | |
6b473aca MC |
198 | #endif |
199 | { | |
200 | TLSEXT_TYPE_session_ticket, | |
fe874d27 MC |
201 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
202 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
203 | init_session_ticket, tls_parse_ctos_session_ticket, |
204 | tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket, | |
205 | tls_construct_ctos_session_ticket, NULL | |
6b473aca | 206 | }, |
ab83e314 | 207 | #ifndef OPENSSL_NO_OCSP |
6b473aca MC |
208 | { |
209 | TLSEXT_TYPE_status_request, | |
fe874d27 MC |
210 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
211 | | SSL_EXT_TLS1_3_CERTIFICATE, | |
1266eefd MC |
212 | init_status_request, tls_parse_ctos_status_request, |
213 | tls_parse_stoc_status_request, tls_construct_stoc_status_request, | |
f63e4288 | 214 | tls_construct_ctos_status_request, NULL |
6b473aca | 215 | }, |
0785274c MC |
216 | #else |
217 | INVALID_EXTENSION, | |
ab83e314 | 218 | #endif |
6b473aca MC |
219 | #ifndef OPENSSL_NO_NEXTPROTONEG |
220 | { | |
221 | TLSEXT_TYPE_next_proto_neg, | |
fe874d27 MC |
222 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
223 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
224 | init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn, |
225 | tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL | |
6b473aca | 226 | }, |
0785274c MC |
227 | #else |
228 | INVALID_EXTENSION, | |
6b473aca MC |
229 | #endif |
230 | { | |
02f0274e MC |
231 | /* |
232 | * Must appear in this list after server_name so that finalisation | |
233 | * happens after server_name callbacks | |
234 | */ | |
6b473aca | 235 | TLSEXT_TYPE_application_layer_protocol_negotiation, |
fe874d27 MC |
236 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
237 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, | |
1266eefd | 238 | init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn, |
630369d9 | 239 | tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn |
6b473aca | 240 | }, |
7da160b0 | 241 | #ifndef OPENSSL_NO_SRTP |
6b473aca MC |
242 | { |
243 | TLSEXT_TYPE_use_srtp, | |
fe874d27 MC |
244 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
245 | | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_DTLS_ONLY, | |
1266eefd MC |
246 | init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp, |
247 | tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL | |
6b473aca | 248 | }, |
0785274c MC |
249 | #else |
250 | INVALID_EXTENSION, | |
7da160b0 | 251 | #endif |
6b473aca MC |
252 | { |
253 | TLSEXT_TYPE_encrypt_then_mac, | |
fe874d27 MC |
254 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
255 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
256 | init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm, |
257 | tls_construct_stoc_etm, tls_construct_ctos_etm, NULL | |
6b473aca | 258 | }, |
6dd083fd | 259 | #ifndef OPENSSL_NO_CT |
6b473aca MC |
260 | { |
261 | TLSEXT_TYPE_signed_certificate_timestamp, | |
fe874d27 MC |
262 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
263 | | SSL_EXT_TLS1_3_CERTIFICATE, | |
68db4dda | 264 | NULL, |
6b473aca MC |
265 | /* |
266 | * No server side support for this, but can be provided by a custom | |
267 | * extension. This is an exception to the rule that custom extensions | |
268 | * cannot override built in ones. | |
269 | */ | |
1266eefd | 270 | NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct, NULL |
6b473aca | 271 | }, |
0785274c MC |
272 | #else |
273 | INVALID_EXTENSION, | |
6dd083fd | 274 | #endif |
6b473aca MC |
275 | { |
276 | TLSEXT_TYPE_extended_master_secret, | |
fe874d27 MC |
277 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
278 | | SSL_EXT_TLS1_2_AND_BELOW_ONLY, | |
1266eefd MC |
279 | init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems, |
280 | tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems | |
6b473aca | 281 | }, |
10ed1b72 TS |
282 | { |
283 | TLSEXT_TYPE_signature_algorithms, | |
284 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, | |
285 | init_sig_algs, tls_parse_ctos_sig_algs, | |
286 | tls_parse_ctos_sig_algs, tls_construct_ctos_sig_algs, | |
287 | tls_construct_ctos_sig_algs, final_sig_algs | |
288 | }, | |
6b473aca MC |
289 | { |
290 | TLSEXT_TYPE_supported_versions, | |
88050dd1 | 291 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
e7dd763e MC |
292 | | SSL_EXT_TLS1_3_SERVER_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST |
293 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY, | |
68db4dda | 294 | NULL, |
6b473aca | 295 | /* Processed inline as part of version selection */ |
88050dd1 MC |
296 | NULL, tls_parse_stoc_supported_versions, |
297 | tls_construct_stoc_supported_versions, | |
298 | tls_construct_ctos_supported_versions, NULL | |
6b473aca | 299 | }, |
b2f7e8c0 | 300 | { |
b2f7e8c0 | 301 | TLSEXT_TYPE_psk_kex_modes, |
fe874d27 MC |
302 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY |
303 | | SSL_EXT_TLS1_3_ONLY, | |
b2f7e8c0 MC |
304 | init_psk_kex_modes, tls_parse_ctos_psk_kex_modes, NULL, NULL, |
305 | tls_construct_ctos_psk_kex_modes, NULL | |
306 | }, | |
deb2d5e7 | 307 | #ifndef OPENSSL_NO_EC |
6b473aca | 308 | { |
70af3d8e MC |
309 | /* |
310 | * Must be in this list after supported_groups. We need that to have | |
311 | * been parsed before we do this one. | |
312 | */ | |
6b473aca | 313 | TLSEXT_TYPE_key_share, |
fe874d27 MC |
314 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
315 | | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY | |
316 | | SSL_EXT_TLS1_3_ONLY, | |
1266eefd | 317 | NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share, |
f4bbb37c MC |
318 | tls_construct_stoc_key_share, tls_construct_ctos_key_share, |
319 | final_key_share | |
7da160b0 | 320 | }, |
deb2d5e7 | 321 | #endif |
cfef5027 MC |
322 | { |
323 | TLSEXT_TYPE_cookie, | |
fe874d27 MC |
324 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST |
325 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
43054d3d MC |
326 | NULL, tls_parse_ctos_cookie, tls_parse_stoc_cookie, |
327 | tls_construct_stoc_cookie, tls_construct_ctos_cookie, NULL | |
cfef5027 | 328 | }, |
7da160b0 MC |
329 | { |
330 | /* | |
331 | * Special unsolicited ServerHello extension only used when | |
332 | * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set | |
333 | */ | |
334 | TLSEXT_TYPE_cryptopro_bug, | |
fe874d27 | 335 | SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY, |
1266eefd | 336 | NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL |
ab83e314 | 337 | }, |
38df5a45 MC |
338 | { |
339 | TLSEXT_TYPE_early_data, | |
fe874d27 MC |
340 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS |
341 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET, | |
38df5a45 MC |
342 | NULL, tls_parse_ctos_early_data, tls_parse_stoc_early_data, |
343 | tls_construct_stoc_early_data, tls_construct_ctos_early_data, | |
344 | final_early_data | |
345 | }, | |
45615c5f DSH |
346 | { |
347 | TLSEXT_TYPE_certificate_authorities, | |
fe874d27 MC |
348 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST |
349 | | SSL_EXT_TLS1_3_ONLY, | |
45615c5f DSH |
350 | init_certificate_authorities, |
351 | tls_parse_certificate_authorities, tls_parse_certificate_authorities, | |
352 | tls_construct_certificate_authorities, | |
353 | tls_construct_certificate_authorities, NULL, | |
354 | }, | |
ab83e314 | 355 | { |
ec15acb6 | 356 | /* Must be immediately before pre_shared_key */ |
ab83e314 | 357 | TLSEXT_TYPE_padding, |
fe874d27 | 358 | SSL_EXT_CLIENT_HELLO, |
68db4dda | 359 | NULL, |
ab83e314 | 360 | /* We send this, but don't read it */ |
1266eefd | 361 | NULL, NULL, NULL, tls_construct_ctos_padding, NULL |
ec15acb6 MC |
362 | }, |
363 | { | |
364 | /* Required by the TLSv1.3 spec to always be the last extension */ | |
365 | TLSEXT_TYPE_psk, | |
fe874d27 MC |
366 | SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO |
367 | | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY, | |
0247086d | 368 | NULL, tls_parse_ctos_psk, tls_parse_stoc_psk, tls_construct_stoc_psk, |
1053a6e2 | 369 | tls_construct_ctos_psk, NULL |
6b473aca MC |
370 | } |
371 | }; | |
372 | ||
43ae5eed MC |
373 | /* Check whether an extension's context matches the current context */ |
374 | static int validate_context(SSL *s, unsigned int extctx, unsigned int thisctx) | |
375 | { | |
376 | /* Check we're allowed to use this extension in this context */ | |
377 | if ((thisctx & extctx) == 0) | |
378 | return 0; | |
379 | ||
380 | if (SSL_IS_DTLS(s)) { | |
381 | if ((extctx & SSL_EXT_TLS_ONLY) != 0) | |
382 | return 0; | |
383 | } else if ((extctx & SSL_EXT_DTLS_ONLY) != 0) { | |
384 | return 0; | |
385 | } | |
386 | ||
387 | return 1; | |
388 | } | |
389 | ||
88050dd1 MC |
390 | int tls_validate_all_contexts(SSL *s, unsigned int thisctx, RAW_EXTENSION *exts) |
391 | { | |
392 | size_t i, num_exts, builtin_num = OSSL_NELEM(ext_defs), offset; | |
393 | RAW_EXTENSION *thisext; | |
394 | unsigned int context; | |
395 | ENDPOINT role = ENDPOINT_BOTH; | |
396 | ||
397 | if ((thisctx & SSL_EXT_CLIENT_HELLO) != 0) | |
398 | role = ENDPOINT_SERVER; | |
399 | else if ((thisctx & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) | |
400 | role = ENDPOINT_CLIENT; | |
401 | ||
402 | /* Calculate the number of extensions in the extensions list */ | |
403 | num_exts = builtin_num + s->cert->custext.meths_count; | |
404 | ||
405 | for (thisext = exts, i = 0; i < num_exts; i++, thisext++) { | |
406 | if (!thisext->present) | |
407 | continue; | |
408 | ||
409 | if (i < builtin_num) { | |
410 | context = ext_defs[i].context; | |
411 | } else { | |
412 | custom_ext_method *meth = NULL; | |
413 | ||
414 | meth = custom_ext_find(&s->cert->custext, role, thisext->type, | |
415 | &offset); | |
416 | if (!ossl_assert(meth != NULL)) | |
417 | return 0; | |
418 | context = meth->context; | |
419 | } | |
420 | ||
421 | if (!validate_context(s, context, thisctx)) | |
422 | return 0; | |
423 | } | |
424 | ||
425 | return 1; | |
426 | } | |
427 | ||
6b473aca MC |
428 | /* |
429 | * Verify whether we are allowed to use the extension |type| in the current | |
430 | * |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to | |
70af3d8e | 431 | * indicate the extension is not allowed. If returning 1 then |*found| is set to |
69687aa8 | 432 | * the definition for the extension we found. |
6b473aca | 433 | */ |
70af3d8e | 434 | static int verify_extension(SSL *s, unsigned int context, unsigned int type, |
1266eefd MC |
435 | custom_ext_methods *meths, RAW_EXTENSION *rawexlist, |
436 | RAW_EXTENSION **found) | |
6b473aca MC |
437 | { |
438 | size_t i; | |
70af3d8e | 439 | size_t builtin_num = OSSL_NELEM(ext_defs); |
d270de32 | 440 | const EXTENSION_DEFINITION *thisext; |
6b473aca | 441 | |
1266eefd MC |
442 | for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) { |
443 | if (type == thisext->type) { | |
43ae5eed | 444 | if (!validate_context(s, thisext->context, context)) |
6b473aca MC |
445 | return 0; |
446 | ||
1266eefd | 447 | *found = &rawexlist[i]; |
6b473aca MC |
448 | return 1; |
449 | } | |
450 | } | |
451 | ||
70af3d8e MC |
452 | /* Check the custom extensions */ |
453 | if (meths != NULL) { | |
43ae5eed | 454 | size_t offset = 0; |
787d9ec7 | 455 | ENDPOINT role = ENDPOINT_BOTH; |
43ae5eed MC |
456 | custom_ext_method *meth = NULL; |
457 | ||
458 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) | |
787d9ec7 | 459 | role = ENDPOINT_SERVER; |
43ae5eed | 460 | else if ((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0) |
787d9ec7 | 461 | role = ENDPOINT_CLIENT; |
43ae5eed | 462 | |
787d9ec7 | 463 | meth = custom_ext_find(meths, role, type, &offset); |
43ae5eed MC |
464 | if (meth != NULL) { |
465 | if (!validate_context(s, meth->context, context)) | |
466 | return 0; | |
467 | *found = &rawexlist[offset + builtin_num]; | |
468 | return 1; | |
6b473aca MC |
469 | } |
470 | } | |
471 | ||
70af3d8e | 472 | /* Unknown extension. We allow it */ |
1266eefd | 473 | *found = NULL; |
70af3d8e | 474 | return 1; |
6b473aca MC |
475 | } |
476 | ||
70af3d8e MC |
477 | /* |
478 | * Check whether the context defined for an extension |extctx| means whether | |
479 | * the extension is relevant for the current context |thisctx| or not. Returns | |
480 | * 1 if the extension is relevant for this context, and 0 otherwise | |
481 | */ | |
43ae5eed | 482 | int extension_is_relevant(SSL *s, unsigned int extctx, unsigned int thisctx) |
805a2e9e | 483 | { |
a2b97bdf MC |
484 | int is_tls13; |
485 | ||
486 | /* | |
487 | * For HRR we haven't selected the version yet but we know it will be | |
488 | * TLSv1.3 | |
489 | */ | |
490 | if ((thisctx & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) | |
491 | is_tls13 = 1; | |
492 | else | |
493 | is_tls13 = SSL_IS_TLS13(s); | |
494 | ||
805a2e9e | 495 | if ((SSL_IS_DTLS(s) |
fe874d27 | 496 | && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0) |
805a2e9e | 497 | || (s->version == SSL3_VERSION |
fe874d27 | 498 | && (extctx & SSL_EXT_SSL3_ALLOWED) == 0) |
a2b97bdf MC |
499 | || (is_tls13 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0) |
500 | || (!is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0) | |
43ae5eed | 501 | || (s->hit && (extctx & SSL_EXT_IGNORE_ON_RESUMPTION) != 0)) |
805a2e9e MC |
502 | return 0; |
503 | ||
504 | return 1; | |
505 | } | |
506 | ||
6b473aca MC |
507 | /* |
508 | * Gather a list of all the extensions from the data in |packet]. |context| | |
70af3d8e | 509 | * tells us which message this extension is for. The raw extension data is |
29bfd5b7 MC |
510 | * stored in |*res| on success. We don't actually process the content of the |
511 | * extensions yet, except to check their types. This function also runs the | |
512 | * initialiser functions for all known extensions if |init| is nonzero (whether | |
513 | * we have collected them or not). If successful the caller is responsible for | |
514 | * freeing the contents of |*res|. | |
6b473aca MC |
515 | * |
516 | * Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be | |
517 | * more than one extension of the same type in a ClientHello or ServerHello. | |
518 | * This function returns 1 if all extensions are unique and we have parsed their | |
519 | * types, and 0 if the extensions contain duplicates, could not be successfully | |
1266eefd | 520 | * found, or an internal error occurred. We only check duplicates for |
70af3d8e | 521 | * extensions that we know about. We ignore others. |
6b473aca | 522 | */ |
6b473aca | 523 | int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context, |
f63a17d6 | 524 | RAW_EXTENSION **res, size_t *len, int init) |
6b473aca MC |
525 | { |
526 | PACKET extensions = *packet; | |
d270de32 | 527 | size_t i = 0; |
fc5ece2e | 528 | size_t num_exts; |
43ae5eed | 529 | custom_ext_methods *exts = &s->cert->custext; |
6b473aca | 530 | RAW_EXTENSION *raw_extensions = NULL; |
d270de32 | 531 | const EXTENSION_DEFINITION *thisexd; |
6b473aca | 532 | |
ecc2f938 MC |
533 | *res = NULL; |
534 | ||
70af3d8e MC |
535 | /* |
536 | * Initialise server side custom extensions. Client side is done during | |
537 | * construction of extensions for the ClientHello. | |
538 | */ | |
43ae5eed MC |
539 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) |
540 | custom_ext_init(&s->cert->custext); | |
70af3d8e | 541 | |
fc5ece2e BK |
542 | num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0); |
543 | raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions)); | |
70af3d8e | 544 | if (raw_extensions == NULL) { |
f63a17d6 MC |
545 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_COLLECT_EXTENSIONS, |
546 | ERR_R_MALLOC_FAILURE); | |
70af3d8e MC |
547 | return 0; |
548 | } | |
549 | ||
193b5d76 | 550 | i = 0; |
6b473aca | 551 | while (PACKET_remaining(&extensions) > 0) { |
b186a592 | 552 | unsigned int type, idx; |
6b473aca | 553 | PACKET extension; |
1266eefd | 554 | RAW_EXTENSION *thisex; |
6b473aca MC |
555 | |
556 | if (!PACKET_get_net_2(&extensions, &type) || | |
557 | !PACKET_get_length_prefixed_2(&extensions, &extension)) { | |
f63a17d6 MC |
558 | SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_COLLECT_EXTENSIONS, |
559 | SSL_R_BAD_EXTENSION); | |
6b473aca MC |
560 | goto err; |
561 | } | |
70af3d8e MC |
562 | /* |
563 | * Verify this extension is allowed. We only check duplicates for | |
652a6b7e MC |
564 | * extensions that we recognise. We also have a special case for the |
565 | * PSK extension, which must be the last one in the ClientHello. | |
70af3d8e | 566 | */ |
1266eefd | 567 | if (!verify_extension(s, context, type, exts, raw_extensions, &thisex) |
652a6b7e MC |
568 | || (thisex != NULL && thisex->present == 1) |
569 | || (type == TLSEXT_TYPE_psk | |
fe874d27 | 570 | && (context & SSL_EXT_CLIENT_HELLO) != 0 |
652a6b7e | 571 | && PACKET_remaining(&extensions) != 0)) { |
f63a17d6 MC |
572 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_COLLECT_EXTENSIONS, |
573 | SSL_R_BAD_EXTENSION); | |
6b473aca MC |
574 | goto err; |
575 | } | |
b186a592 MC |
576 | idx = thisex - raw_extensions; |
577 | /*- | |
578 | * Check that we requested this extension (if appropriate). Requests can | |
579 | * be sent in the ClientHello and CertificateRequest. Unsolicited | |
580 | * extensions can be sent in the NewSessionTicket. We only do this for | |
581 | * the built-in extensions. Custom extensions have a different but | |
582 | * similar check elsewhere. | |
583 | * Special cases: | |
584 | * - The HRR cookie extension is unsolicited | |
585 | * - The renegotiate extension is unsolicited (the client signals | |
586 | * support via an SCSV) | |
587 | * - The signed_certificate_timestamp extension can be provided by a | |
588 | * custom extension or by the built-in version. We let the extension | |
589 | * itself handle unsolicited response checks. | |
590 | */ | |
591 | if (idx < OSSL_NELEM(ext_defs) | |
592 | && (context & (SSL_EXT_CLIENT_HELLO | |
593 | | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
594 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) == 0 | |
595 | && type != TLSEXT_TYPE_cookie | |
596 | && type != TLSEXT_TYPE_renegotiate | |
597 | && type != TLSEXT_TYPE_signed_certificate_timestamp | |
598 | && (s->ext.extflags[idx] & SSL_EXT_FLAG_SENT) == 0) { | |
f63a17d6 MC |
599 | SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION, |
600 | SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_UNSOLICITED_EXTENSION); | |
b186a592 MC |
601 | goto err; |
602 | } | |
1266eefd MC |
603 | if (thisex != NULL) { |
604 | thisex->data = extension; | |
605 | thisex->present = 1; | |
606 | thisex->type = type; | |
193b5d76 | 607 | thisex->received_order = i++; |
b93a295a TS |
608 | if (s->ext.debug_cb) |
609 | s->ext.debug_cb(s, !s->server, thisex->type, | |
610 | PACKET_data(&thisex->data), | |
611 | PACKET_remaining(&thisex->data), | |
612 | s->ext.debug_arg); | |
6b473aca MC |
613 | } |
614 | } | |
615 | ||
735d5b59 TT |
616 | if (init) { |
617 | /* | |
618 | * Initialise all known extensions relevant to this context, | |
619 | * whether we have found them or not | |
620 | */ | |
621 | for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs); | |
622 | i++, thisexd++) { | |
bf5c84f5 TT |
623 | if (thisexd->init != NULL && (thisexd->context & context) != 0 |
624 | && extension_is_relevant(s, thisexd->context, context) | |
625 | && !thisexd->init(s, context)) { | |
f63a17d6 | 626 | /* SSLfatal() already called */ |
735d5b59 TT |
627 | goto err; |
628 | } | |
68db4dda MC |
629 | } |
630 | } | |
631 | ||
6b473aca | 632 | *res = raw_extensions; |
fc5ece2e BK |
633 | if (len != NULL) |
634 | *len = num_exts; | |
6b473aca MC |
635 | return 1; |
636 | ||
637 | err: | |
638 | OPENSSL_free(raw_extensions); | |
639 | return 0; | |
640 | } | |
641 | ||
68db4dda | 642 | /* |
70af3d8e MC |
643 | * Runs the parser for a given extension with index |idx|. |exts| contains the |
644 | * list of all parsed extensions previously collected by | |
645 | * tls_collect_extensions(). The parser is only run if it is applicable for the | |
f97d4c37 MC |
646 | * given |context| and the parser has not already been run. If this is for a |
647 | * Certificate message, then we also provide the parser with the relevant | |
8521ced6 | 648 | * Certificate |x| and its position in the |chainidx| with 0 being the first |
29bfd5b7 MC |
649 | * Certificate. Returns 1 on success or 0 on failure. If an extension is not |
650 | * present this counted as success. | |
68db4dda | 651 | */ |
d270de32 | 652 | int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context, |
f63a17d6 | 653 | RAW_EXTENSION *exts, X509 *x, size_t chainidx) |
6b473aca | 654 | { |
70af3d8e | 655 | RAW_EXTENSION *currext = &exts[idx]; |
61138358 | 656 | int (*parser)(SSL *s, PACKET *pkt, unsigned int context, X509 *x, |
f63a17d6 | 657 | size_t chainidx) = NULL; |
6b473aca | 658 | |
70af3d8e MC |
659 | /* Skip if the extension is not present */ |
660 | if (!currext->present) | |
661 | return 1; | |
6b473aca | 662 | |
70af3d8e MC |
663 | /* Skip if we've already parsed this extension */ |
664 | if (currext->parsed) | |
665 | return 1; | |
6b473aca | 666 | |
70af3d8e MC |
667 | currext->parsed = 1; |
668 | ||
669 | if (idx < OSSL_NELEM(ext_defs)) { | |
670 | /* We are handling a built-in extension */ | |
671 | const EXTENSION_DEFINITION *extdef = &ext_defs[idx]; | |
672 | ||
673 | /* Check if extension is defined for our protocol. If not, skip */ | |
674 | if (!extension_is_relevant(s, extdef->context, context)) | |
675 | return 1; | |
676 | ||
1266eefd | 677 | parser = s->server ? extdef->parse_ctos : extdef->parse_stoc; |
224135e9 | 678 | |
1266eefd | 679 | if (parser != NULL) |
f63a17d6 | 680 | return parser(s, &currext->data, context, x, chainidx); |
6b473aca | 681 | |
70af3d8e MC |
682 | /* |
683 | * If the parser is NULL we fall through to the custom extension | |
684 | * processing | |
685 | */ | |
6b473aca MC |
686 | } |
687 | ||
43ae5eed | 688 | /* Parse custom extensions */ |
f63a17d6 MC |
689 | return custom_ext_parse(s, context, currext->type, |
690 | PACKET_data(&currext->data), | |
691 | PACKET_remaining(&currext->data), | |
692 | x, chainidx); | |
805a2e9e MC |
693 | } |
694 | ||
695 | /* | |
696 | * Parse all remaining extensions that have not yet been parsed. Also calls the | |
735d5b59 TT |
697 | * finalisation for all extensions at the end if |fin| is nonzero, whether we |
698 | * collected them or not. Returns 1 for success or 0 for failure. If we are | |
699 | * working on a Certificate message then we also pass the Certificate |x| and | |
29bfd5b7 | 700 | * its position in the |chainidx|, with 0 being the first certificate. |
805a2e9e | 701 | */ |
f97d4c37 | 702 | int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts, X509 *x, |
f63a17d6 | 703 | size_t chainidx, int fin) |
805a2e9e | 704 | { |
1266eefd | 705 | size_t i, numexts = OSSL_NELEM(ext_defs); |
d270de32 | 706 | const EXTENSION_DEFINITION *thisexd; |
805a2e9e | 707 | |
70af3d8e | 708 | /* Calculate the number of extensions in the extensions list */ |
43ae5eed | 709 | numexts += s->cert->custext.meths_count; |
70af3d8e MC |
710 | |
711 | /* Parse each extension in turn */ | |
1266eefd | 712 | for (i = 0; i < numexts; i++) { |
f63a17d6 MC |
713 | if (!tls_parse_extension(s, i, context, exts, x, chainidx)) { |
714 | /* SSLfatal() already called */ | |
70af3d8e | 715 | return 0; |
f63a17d6 | 716 | } |
70af3d8e | 717 | } |
805a2e9e | 718 | |
735d5b59 TT |
719 | if (fin) { |
720 | /* | |
721 | * Finalise all known extensions relevant to this context, | |
722 | * whether we have found them or not | |
723 | */ | |
724 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); | |
725 | i++, thisexd++) { | |
bf5c84f5 | 726 | if (thisexd->final != NULL && (thisexd->context & context) != 0 |
f63a17d6 MC |
727 | && !thisexd->final(s, context, exts[i].present)) { |
728 | /* SSLfatal() already called */ | |
735d5b59 | 729 | return 0; |
f63a17d6 | 730 | } |
735d5b59 | 731 | } |
68db4dda MC |
732 | } |
733 | ||
6b473aca MC |
734 | return 1; |
735 | } | |
736 | ||
43ae5eed MC |
737 | int should_add_extension(SSL *s, unsigned int extctx, unsigned int thisctx, |
738 | int max_version) | |
739 | { | |
740 | /* Skip if not relevant for our context */ | |
741 | if ((extctx & thisctx) == 0) | |
742 | return 0; | |
743 | ||
744 | /* Check if this extension is defined for our protocol. If not, skip */ | |
745 | if ((SSL_IS_DTLS(s) && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0) | |
746 | || (s->version == SSL3_VERSION | |
747 | && (extctx & SSL_EXT_SSL3_ALLOWED) == 0) | |
748 | || (SSL_IS_TLS13(s) | |
749 | && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0) | |
750 | || (!SSL_IS_TLS13(s) | |
751 | && (extctx & SSL_EXT_TLS1_3_ONLY) != 0 | |
752 | && (thisctx & SSL_EXT_CLIENT_HELLO) == 0) | |
753 | || ((extctx & SSL_EXT_TLS1_3_ONLY) != 0 | |
754 | && (thisctx & SSL_EXT_CLIENT_HELLO) != 0 | |
755 | && (SSL_IS_DTLS(s) || max_version < TLS1_3_VERSION))) | |
756 | return 0; | |
757 | ||
758 | return 1; | |
759 | } | |
760 | ||
6b473aca | 761 | /* |
70af3d8e | 762 | * Construct all the extensions relevant to the current |context| and write |
30aeba43 | 763 | * them to |pkt|. If this is an extension for a Certificate in a Certificate |
8521ced6 MC |
764 | * message, then |x| will be set to the Certificate we are handling, and |
765 | * |chainidx| will indicate the position in the chainidx we are processing (with | |
f63a17d6 | 766 | * 0 being the first in the chain). Returns 1 on success or 0 on failure. On a |
8521ced6 | 767 | * failure construction stops at the first extension to fail to construct. |
6b473aca | 768 | */ |
224135e9 | 769 | int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 770 | X509 *x, size_t chainidx) |
224135e9 | 771 | { |
1266eefd | 772 | size_t i; |
f63a17d6 | 773 | int min_version, max_version = 0, reason; |
d270de32 | 774 | const EXTENSION_DEFINITION *thisexd; |
224135e9 MC |
775 | |
776 | if (!WPACKET_start_sub_packet_u16(pkt) | |
777 | /* | |
778 | * If extensions are of zero length then we don't even add the | |
1c259bb5 BK |
779 | * extensions length bytes to a ClientHello/ServerHello |
780 | * (for non-TLSv1.3). | |
224135e9 | 781 | */ |
fe874d27 MC |
782 | || ((context & |
783 | (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0 | |
fe874d27 | 784 | && !WPACKET_set_flags(pkt, |
224135e9 | 785 | WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) { |
f63a17d6 MC |
786 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_EXTENSIONS, |
787 | ERR_R_INTERNAL_ERROR); | |
788 | return 0; | |
224135e9 MC |
789 | } |
790 | ||
fe874d27 | 791 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
38a73150 | 792 | reason = ssl_get_min_max_version(s, &min_version, &max_version); |
ab83e314 | 793 | if (reason != 0) { |
f63a17d6 MC |
794 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_EXTENSIONS, |
795 | reason); | |
796 | return 0; | |
ab83e314 MC |
797 | } |
798 | } | |
799 | ||
800 | /* Add custom extensions first */ | |
fe874d27 | 801 | if ((context & SSL_EXT_CLIENT_HELLO) != 0) { |
44e69951 | 802 | /* On the server side with initialise during ClientHello parsing */ |
43ae5eed | 803 | custom_ext_init(&s->cert->custext); |
ab83e314 | 804 | } |
f63a17d6 MC |
805 | if (!custom_ext_add(s, context, pkt, x, chainidx, max_version)) { |
806 | /* SSLfatal() already called */ | |
807 | return 0; | |
ab83e314 MC |
808 | } |
809 | ||
1266eefd | 810 | for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) { |
b186a592 | 811 | EXT_RETURN (*construct)(SSL *s, WPACKET *pkt, unsigned int context, |
f63a17d6 | 812 | X509 *x, size_t chainidx); |
b186a592 | 813 | EXT_RETURN ret; |
4b299b8e | 814 | |
224135e9 | 815 | /* Skip if not relevant for our context */ |
43ae5eed | 816 | if (!should_add_extension(s, thisexd->context, context, max_version)) |
224135e9 MC |
817 | continue; |
818 | ||
1266eefd MC |
819 | construct = s->server ? thisexd->construct_stoc |
820 | : thisexd->construct_ctos; | |
224135e9 | 821 | |
43ae5eed | 822 | if (construct == NULL) |
224135e9 MC |
823 | continue; |
824 | ||
f63a17d6 MC |
825 | ret = construct(s, pkt, context, x, chainidx); |
826 | if (ret == EXT_RETURN_FAIL) { | |
827 | /* SSLfatal() already called */ | |
828 | return 0; | |
829 | } | |
b186a592 MC |
830 | if (ret == EXT_RETURN_SENT |
831 | && (context & (SSL_EXT_CLIENT_HELLO | |
832 | | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST | |
833 | | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) != 0) | |
834 | s->ext.extflags[i] |= SSL_EXT_FLAG_SENT; | |
224135e9 MC |
835 | } |
836 | ||
224135e9 | 837 | if (!WPACKET_close(pkt)) { |
f63a17d6 MC |
838 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_EXTENSIONS, |
839 | ERR_R_INTERNAL_ERROR); | |
840 | return 0; | |
224135e9 MC |
841 | } |
842 | ||
843 | return 1; | |
844 | } | |
805a2e9e | 845 | |
70af3d8e MC |
846 | /* |
847 | * Built in extension finalisation and initialisation functions. All initialise | |
848 | * or finalise the associated extension type for the given |context|. For | |
849 | * finalisers |sent| is set to 1 if we saw the extension during parsing, and 0 | |
29bfd5b7 | 850 | * otherwise. These functions return 1 on success or 0 on failure. |
70af3d8e MC |
851 | */ |
852 | ||
f63a17d6 | 853 | static int final_renegotiate(SSL *s, unsigned int context, int sent) |
805a2e9e | 854 | { |
332eb390 MC |
855 | if (!s->server) { |
856 | /* | |
857 | * Check if we can connect to a server that doesn't support safe | |
858 | * renegotiation | |
859 | */ | |
860 | if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
861 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
862 | && !sent) { | |
f63a17d6 MC |
863 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_FINAL_RENEGOTIATE, |
864 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); | |
332eb390 MC |
865 | return 0; |
866 | } | |
867 | ||
805a2e9e | 868 | return 1; |
332eb390 | 869 | } |
805a2e9e MC |
870 | |
871 | /* Need RI if renegotiating */ | |
872 | if (s->renegotiate | |
873 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) | |
874 | && !sent) { | |
f63a17d6 MC |
875 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_FINAL_RENEGOTIATE, |
876 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); | |
805a2e9e MC |
877 | return 0; |
878 | } | |
879 | ||
332eb390 | 880 | |
805a2e9e MC |
881 | return 1; |
882 | } | |
883 | ||
1266eefd | 884 | static int init_server_name(SSL *s, unsigned int context) |
805a2e9e MC |
885 | { |
886 | if (s->server) | |
887 | s->servername_done = 0; | |
888 | ||
889 | return 1; | |
890 | } | |
891 | ||
f63a17d6 | 892 | static int final_server_name(SSL *s, unsigned int context, int sent) |
805a2e9e | 893 | { |
3be08e30 | 894 | int ret = SSL_TLSEXT_ERR_NOACK, discard; |
805a2e9e | 895 | int altmp = SSL_AD_UNRECOGNIZED_NAME; |
a84e5c9a | 896 | int was_ticket = (SSL_get_options(s) & SSL_OP_NO_TICKET) == 0; |
805a2e9e | 897 | |
aff8c126 RS |
898 | if (s->ctx != NULL && s->ctx->ext.servername_cb != 0) |
899 | ret = s->ctx->ext.servername_cb(s, &altmp, | |
900 | s->ctx->ext.servername_arg); | |
222da979 TS |
901 | else if (s->session_ctx != NULL |
902 | && s->session_ctx->ext.servername_cb != 0) | |
903 | ret = s->session_ctx->ext.servername_cb(s, &altmp, | |
904 | s->session_ctx->ext.servername_arg); | |
805a2e9e | 905 | |
9fb6cb81 MC |
906 | if (!sent) { |
907 | OPENSSL_free(s->session->ext.hostname); | |
908 | s->session->ext.hostname = NULL; | |
909 | } | |
910 | ||
3be08e30 BK |
911 | /* |
912 | * If we switched contexts (whether here or in the client_hello callback), | |
913 | * move the sess_accept increment from the session_ctx to the new | |
914 | * context, to avoid the confusing situation of having sess_accept_good | |
915 | * exceed sess_accept (zero) for the new context. | |
916 | */ | |
917 | if (SSL_IS_FIRST_HANDSHAKE(s) && s->ctx != s->session_ctx) { | |
918 | CRYPTO_atomic_add(&s->ctx->stats.sess_accept, 1, &discard, | |
919 | s->ctx->lock); | |
920 | CRYPTO_atomic_add(&s->session_ctx->stats.sess_accept, -1, &discard, | |
921 | s->session_ctx->lock); | |
922 | } | |
923 | ||
a84e5c9a TS |
924 | /* |
925 | * If we're expecting to send a ticket, and tickets were previously enabled, | |
926 | * and now tickets are disabled, then turn off expected ticket. | |
927 | * Also, if this is not a resumption, create a new session ID | |
928 | */ | |
929 | if (ret == SSL_TLSEXT_ERR_OK && s->ext.ticket_expected | |
930 | && was_ticket && (SSL_get_options(s) & SSL_OP_NO_TICKET) != 0) { | |
931 | s->ext.ticket_expected = 0; | |
932 | if (!s->hit) { | |
933 | SSL_SESSION* ss = SSL_get_session(s); | |
934 | ||
935 | if (ss != NULL) { | |
936 | OPENSSL_free(ss->ext.tick); | |
937 | ss->ext.tick = NULL; | |
938 | ss->ext.ticklen = 0; | |
939 | ss->ext.tick_lifetime_hint = 0; | |
940 | ss->ext.tick_age_add = 0; | |
941 | ss->ext.tick_identity = 0; | |
942 | if (!ssl_generate_session_id(s, ss)) { | |
f63a17d6 MC |
943 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_FINAL_SERVER_NAME, |
944 | ERR_R_INTERNAL_ERROR); | |
945 | return 0; | |
a84e5c9a TS |
946 | } |
947 | } else { | |
f63a17d6 MC |
948 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_FINAL_SERVER_NAME, |
949 | ERR_R_INTERNAL_ERROR); | |
950 | return 0; | |
a84e5c9a TS |
951 | } |
952 | } | |
953 | } | |
954 | ||
805a2e9e MC |
955 | switch (ret) { |
956 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
f63a17d6 | 957 | SSLfatal(s, altmp, SSL_F_FINAL_SERVER_NAME, SSL_R_CALLBACK_FAILED); |
805a2e9e MC |
958 | return 0; |
959 | ||
960 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
f63a17d6 | 961 | ssl3_send_alert(s, SSL3_AL_WARNING, altmp); |
805a2e9e MC |
962 | return 1; |
963 | ||
964 | case SSL_TLSEXT_ERR_NOACK: | |
965 | s->servername_done = 0; | |
966 | return 1; | |
967 | ||
968 | default: | |
969 | return 1; | |
970 | } | |
971 | } | |
972 | ||
332eb390 | 973 | #ifndef OPENSSL_NO_EC |
f63a17d6 | 974 | static int final_ec_pt_formats(SSL *s, unsigned int context, int sent) |
332eb390 MC |
975 | { |
976 | unsigned long alg_k, alg_a; | |
977 | ||
978 | if (s->server) | |
979 | return 1; | |
980 | ||
981 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
982 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
983 | ||
984 | /* | |
985 | * If we are client and using an elliptic curve cryptography cipher | |
986 | * suite, then if server returns an EC point formats lists extension it | |
987 | * must contain uncompressed. | |
988 | */ | |
aff8c126 RS |
989 | if (s->ext.ecpointformats != NULL |
990 | && s->ext.ecpointformats_len > 0 | |
991 | && s->session->ext.ecpointformats != NULL | |
992 | && s->session->ext.ecpointformats_len > 0 | |
1266eefd | 993 | && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) { |
332eb390 MC |
994 | /* we are using an ECC cipher */ |
995 | size_t i; | |
aff8c126 | 996 | unsigned char *list = s->session->ext.ecpointformats; |
1266eefd | 997 | |
aff8c126 | 998 | for (i = 0; i < s->session->ext.ecpointformats_len; i++) { |
1266eefd | 999 | if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed) |
332eb390 | 1000 | break; |
332eb390 | 1001 | } |
aff8c126 | 1002 | if (i == s->session->ext.ecpointformats_len) { |
f63a17d6 MC |
1003 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_FINAL_EC_PT_FORMATS, |
1004 | SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); | |
332eb390 MC |
1005 | return 0; |
1006 | } | |
1007 | } | |
1008 | ||
1009 | return 1; | |
1010 | } | |
1011 | #endif | |
1012 | ||
1266eefd | 1013 | static int init_session_ticket(SSL *s, unsigned int context) |
332eb390 MC |
1014 | { |
1015 | if (!s->server) | |
aff8c126 | 1016 | s->ext.ticket_expected = 0; |
332eb390 MC |
1017 | |
1018 | return 1; | |
1019 | } | |
1020 | ||
8f8c11d8 | 1021 | #ifndef OPENSSL_NO_OCSP |
1266eefd | 1022 | static int init_status_request(SSL *s, unsigned int context) |
805a2e9e | 1023 | { |
f63e4288 | 1024 | if (s->server) { |
aff8c126 | 1025 | s->ext.status_type = TLSEXT_STATUSTYPE_nothing; |
f63e4288 MC |
1026 | } else { |
1027 | /* | |
1028 | * Ensure we get sensible values passed to tlsext_status_cb in the event | |
1029 | * that we don't receive a status message | |
1030 | */ | |
8cbfcc70 RS |
1031 | OPENSSL_free(s->ext.ocsp.resp); |
1032 | s->ext.ocsp.resp = NULL; | |
1033 | s->ext.ocsp.resp_len = 0; | |
f63e4288 | 1034 | } |
332eb390 MC |
1035 | |
1036 | return 1; | |
1037 | } | |
8f8c11d8 | 1038 | #endif |
332eb390 | 1039 | |
805a2e9e | 1040 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1266eefd | 1041 | static int init_npn(SSL *s, unsigned int context) |
805a2e9e | 1042 | { |
aff8c126 | 1043 | s->s3->npn_seen = 0; |
805a2e9e MC |
1044 | |
1045 | return 1; | |
1046 | } | |
1047 | #endif | |
1048 | ||
1266eefd | 1049 | static int init_alpn(SSL *s, unsigned int context) |
805a2e9e | 1050 | { |
332eb390 MC |
1051 | OPENSSL_free(s->s3->alpn_selected); |
1052 | s->s3->alpn_selected = NULL; | |
a5bb1aa1 | 1053 | s->s3->alpn_selected_len = 0; |
805a2e9e | 1054 | if (s->server) { |
805a2e9e MC |
1055 | OPENSSL_free(s->s3->alpn_proposed); |
1056 | s->s3->alpn_proposed = NULL; | |
1057 | s->s3->alpn_proposed_len = 0; | |
1058 | } | |
805a2e9e MC |
1059 | return 1; |
1060 | } | |
1061 | ||
f63a17d6 | 1062 | static int final_alpn(SSL *s, unsigned int context, int sent) |
630369d9 | 1063 | { |
4be3a7c7 MC |
1064 | if (!s->server && !sent && s->session->ext.alpn_selected != NULL) |
1065 | s->ext.early_data_ok = 0; | |
1066 | ||
630369d9 MC |
1067 | if (!s->server || !SSL_IS_TLS13(s)) |
1068 | return 1; | |
1069 | ||
1070 | /* | |
1071 | * Call alpn_select callback if needed. Has to be done after SNI and | |
1072 | * cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3 | |
1073 | * we also have to do this before we decide whether to accept early_data. | |
1074 | * In TLSv1.3 we've already negotiated our cipher so we do this call now. | |
1075 | * For < TLSv1.3 we defer it until after cipher negotiation. | |
56d36288 | 1076 | * |
f63a17d6 | 1077 | * On failure SSLfatal() already called. |
630369d9 | 1078 | */ |
f63a17d6 | 1079 | return tls_handle_alpn(s); |
630369d9 MC |
1080 | } |
1081 | ||
1266eefd | 1082 | static int init_sig_algs(SSL *s, unsigned int context) |
805a2e9e MC |
1083 | { |
1084 | /* Clear any signature algorithms extension received */ | |
1085 | OPENSSL_free(s->s3->tmp.peer_sigalgs); | |
1086 | s->s3->tmp.peer_sigalgs = NULL; | |
1087 | ||
1088 | return 1; | |
1089 | } | |
1090 | ||
1091 | #ifndef OPENSSL_NO_SRP | |
1266eefd | 1092 | static int init_srp(SSL *s, unsigned int context) |
805a2e9e MC |
1093 | { |
1094 | OPENSSL_free(s->srp_ctx.login); | |
1095 | s->srp_ctx.login = NULL; | |
1096 | ||
1097 | return 1; | |
1098 | } | |
1099 | #endif | |
1100 | ||
1266eefd | 1101 | static int init_etm(SSL *s, unsigned int context) |
805a2e9e | 1102 | { |
28a31a0a | 1103 | s->ext.use_etm = 0; |
332eb390 MC |
1104 | |
1105 | return 1; | |
1106 | } | |
1107 | ||
1266eefd | 1108 | static int init_ems(SSL *s, unsigned int context) |
332eb390 MC |
1109 | { |
1110 | if (!s->server) | |
1111 | s->s3->flags &= ~TLS1_FLAGS_RECEIVED_EXTMS; | |
1112 | ||
1113 | return 1; | |
1114 | } | |
1115 | ||
f63a17d6 | 1116 | static int final_ems(SSL *s, unsigned int context, int sent) |
332eb390 MC |
1117 | { |
1118 | if (!s->server && s->hit) { | |
1119 | /* | |
1120 | * Check extended master secret extension is consistent with | |
1121 | * original session. | |
1122 | */ | |
1123 | if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) != | |
1124 | !(s->session->flags & SSL_SESS_FLAG_EXTMS)) { | |
f63a17d6 MC |
1125 | SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_FINAL_EMS, |
1126 | SSL_R_INCONSISTENT_EXTMS); | |
332eb390 MC |
1127 | return 0; |
1128 | } | |
1129 | } | |
805a2e9e MC |
1130 | |
1131 | return 1; | |
1132 | } | |
1133 | ||
45615c5f DSH |
1134 | static int init_certificate_authorities(SSL *s, unsigned int context) |
1135 | { | |
fa7c2637 DSH |
1136 | sk_X509_NAME_pop_free(s->s3->tmp.peer_ca_names, X509_NAME_free); |
1137 | s->s3->tmp.peer_ca_names = NULL; | |
45615c5f DSH |
1138 | return 1; |
1139 | } | |
1140 | ||
b186a592 MC |
1141 | static EXT_RETURN tls_construct_certificate_authorities(SSL *s, WPACKET *pkt, |
1142 | unsigned int context, | |
1143 | X509 *x, | |
f63a17d6 | 1144 | size_t chainidx) |
45615c5f | 1145 | { |
9784ec04 | 1146 | const STACK_OF(X509_NAME) *ca_sk = SSL_get0_CA_list(s); |
45615c5f DSH |
1147 | |
1148 | if (ca_sk == NULL || sk_X509_NAME_num(ca_sk) == 0) | |
b186a592 | 1149 | return EXT_RETURN_NOT_SENT; |
45615c5f DSH |
1150 | |
1151 | if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_certificate_authorities) | |
f63a17d6 MC |
1152 | || !WPACKET_start_sub_packet_u16(pkt)) { |
1153 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, | |
1154 | SSL_F_TLS_CONSTRUCT_CERTIFICATE_AUTHORITIES, | |
45615c5f | 1155 | ERR_R_INTERNAL_ERROR); |
b186a592 | 1156 | return EXT_RETURN_FAIL; |
45615c5f DSH |
1157 | } |
1158 | ||
f63a17d6 MC |
1159 | if (!construct_ca_names(s, pkt)) { |
1160 | /* SSLfatal() already called */ | |
1161 | return EXT_RETURN_FAIL; | |
1162 | } | |
1163 | ||
1164 | if (!WPACKET_close(pkt)) { | |
1165 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, | |
1166 | SSL_F_TLS_CONSTRUCT_CERTIFICATE_AUTHORITIES, | |
1167 | ERR_R_INTERNAL_ERROR); | |
1168 | return EXT_RETURN_FAIL; | |
1169 | } | |
1170 | ||
b186a592 | 1171 | return EXT_RETURN_SENT; |
45615c5f DSH |
1172 | } |
1173 | ||
1174 | static int tls_parse_certificate_authorities(SSL *s, PACKET *pkt, | |
1175 | unsigned int context, X509 *x, | |
f63a17d6 | 1176 | size_t chainidx) |
45615c5f | 1177 | { |
f63a17d6 | 1178 | if (!parse_ca_names(s, pkt)) |
45615c5f DSH |
1179 | return 0; |
1180 | if (PACKET_remaining(pkt) != 0) { | |
f63a17d6 MC |
1181 | SSLfatal(s, SSL_AD_DECODE_ERROR, |
1182 | SSL_F_TLS_PARSE_CERTIFICATE_AUTHORITIES, SSL_R_BAD_EXTENSION); | |
45615c5f DSH |
1183 | return 0; |
1184 | } | |
1185 | return 1; | |
1186 | } | |
1187 | ||
805a2e9e | 1188 | #ifndef OPENSSL_NO_SRTP |
1266eefd | 1189 | static int init_srtp(SSL *s, unsigned int context) |
805a2e9e MC |
1190 | { |
1191 | if (s->server) | |
1192 | s->srtp_profile = NULL; | |
1193 | ||
1194 | return 1; | |
1195 | } | |
1196 | #endif | |
04904312 | 1197 | |
f63a17d6 | 1198 | static int final_sig_algs(SSL *s, unsigned int context, int sent) |
04904312 | 1199 | { |
108d45df | 1200 | if (!sent && SSL_IS_TLS13(s) && !s->hit) { |
f63a17d6 MC |
1201 | SSLfatal(s, TLS13_AD_MISSING_EXTENSION, SSL_F_FINAL_SIG_ALGS, |
1202 | SSL_R_MISSING_SIGALGS_EXTENSION); | |
04904312 MC |
1203 | return 0; |
1204 | } | |
1205 | ||
1206 | return 1; | |
1207 | } | |
b2f7e8c0 | 1208 | |
deb2d5e7 | 1209 | #ifndef OPENSSL_NO_EC |
f63a17d6 | 1210 | static int final_key_share(SSL *s, unsigned int context, int sent) |
f4bbb37c MC |
1211 | { |
1212 | if (!SSL_IS_TLS13(s)) | |
1213 | return 1; | |
1214 | ||
07d447a6 MC |
1215 | /* Nothing to do for key_share in an HRR */ |
1216 | if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0) | |
1217 | return 1; | |
1218 | ||
f4bbb37c MC |
1219 | /* |
1220 | * If | |
aff9929b MC |
1221 | * we are a client |
1222 | * AND | |
f4bbb37c MC |
1223 | * we have no key_share |
1224 | * AND | |
1225 | * (we are not resuming | |
1226 | * OR the kex_mode doesn't allow non key_share resumes) | |
1227 | * THEN | |
aff9929b | 1228 | * fail; |
f4bbb37c | 1229 | */ |
aff9929b MC |
1230 | if (!s->server |
1231 | && !sent | |
f4bbb37c MC |
1232 | && (!s->hit |
1233 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) { | |
7d061fce | 1234 | /* Nothing left we can do - just fail */ |
f63a17d6 MC |
1235 | SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_F_FINAL_KEY_SHARE, |
1236 | SSL_R_NO_SUITABLE_KEY_SHARE); | |
f4bbb37c MC |
1237 | return 0; |
1238 | } | |
aff9929b MC |
1239 | /* |
1240 | * If | |
1241 | * we are a server | |
1242 | * AND | |
1243 | * we have no key_share | |
1244 | * THEN | |
1245 | * If | |
1246 | * we didn't already send a HelloRetryRequest | |
1247 | * AND | |
1248 | * the client sent a key_share extension | |
1249 | * AND | |
1250 | * (we are not resuming | |
1251 | * OR the kex_mode allows key_share resumes) | |
1252 | * AND | |
1253 | * a shared group exists | |
1254 | * THEN | |
1255 | * send a HelloRetryRequest | |
1256 | * ELSE If | |
1257 | * we are not resuming | |
1258 | * OR | |
1259 | * the kex_mode doesn't allow non key_share resumes | |
1260 | * THEN | |
1261 | * fail; | |
1262 | */ | |
1263 | if (s->server && s->s3->peer_tmp == NULL) { | |
1264 | /* No suitable share */ | |
fc7129dc | 1265 | if (s->hello_retry_request == SSL_HRR_NONE && sent |
aff9929b MC |
1266 | && (!s->hit |
1267 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE) | |
1268 | != 0)) { | |
f48d826e DSH |
1269 | const uint16_t *pgroups, *clntgroups; |
1270 | size_t num_groups, clnt_num_groups, i; | |
319a33d0 | 1271 | unsigned int group_id = 0; |
aff9929b | 1272 | |
2248dbeb | 1273 | /* Check if a shared group exists */ |
aff9929b MC |
1274 | |
1275 | /* Get the clients list of supported groups. */ | |
f48d826e DSH |
1276 | tls1_get_peer_groups(s, &clntgroups, &clnt_num_groups); |
1277 | tls1_get_supported_groups(s, &pgroups, &num_groups); | |
aff9929b MC |
1278 | |
1279 | /* Find the first group we allow that is also in client's list */ | |
f48d826e DSH |
1280 | for (i = 0; i < num_groups; i++) { |
1281 | group_id = pgroups[i]; | |
aff9929b | 1282 | |
f48d826e | 1283 | if (check_in_list(s, group_id, clntgroups, clnt_num_groups, 1)) |
aff9929b MC |
1284 | break; |
1285 | } | |
1286 | ||
f48d826e | 1287 | if (i < num_groups) { |
aff9929b MC |
1288 | /* A shared group exists so send a HelloRetryRequest */ |
1289 | s->s3->group_id = group_id; | |
fc7129dc | 1290 | s->hello_retry_request = SSL_HRR_PENDING; |
aff9929b MC |
1291 | return 1; |
1292 | } | |
1293 | } | |
1294 | if (!s->hit | |
1295 | || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) { | |
1296 | /* Nothing left we can do - just fail */ | |
f63a17d6 MC |
1297 | SSLfatal(s, |
1298 | sent ? SSL_AD_HANDSHAKE_FAILURE : SSL_AD_MISSING_EXTENSION, | |
1299 | SSL_F_FINAL_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE); | |
aff9929b MC |
1300 | return 0; |
1301 | } | |
1302 | } | |
1303 | ||
1304 | /* We have a key_share so don't send any more HelloRetryRequest messages */ | |
fc7129dc MC |
1305 | if (s->server && s->hello_retry_request == SSL_HRR_PENDING) |
1306 | s->hello_retry_request = SSL_HRR_COMPLETE; | |
f4bbb37c MC |
1307 | |
1308 | /* | |
1309 | * For a client side resumption with no key_share we need to generate | |
1310 | * the handshake secret (otherwise this is done during key_share | |
1311 | * processing). | |
1312 | */ | |
1313 | if (!sent && !s->server && !tls13_generate_handshake_secret(s, NULL, 0)) { | |
f63a17d6 MC |
1314 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_FINAL_KEY_SHARE, |
1315 | ERR_R_INTERNAL_ERROR); | |
f4bbb37c MC |
1316 | return 0; |
1317 | } | |
1318 | ||
1319 | return 1; | |
1320 | } | |
deb2d5e7 | 1321 | #endif |
f4bbb37c | 1322 | |
b2f7e8c0 MC |
1323 | static int init_psk_kex_modes(SSL *s, unsigned int context) |
1324 | { | |
1325 | s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE; | |
b2f7e8c0 MC |
1326 | return 1; |
1327 | } | |
1053a6e2 MC |
1328 | |
1329 | int tls_psk_do_binder(SSL *s, const EVP_MD *md, const unsigned char *msgstart, | |
1330 | size_t binderoffset, const unsigned char *binderin, | |
3a7c56b2 MC |
1331 | unsigned char *binderout, SSL_SESSION *sess, int sign, |
1332 | int external) | |
1053a6e2 MC |
1333 | { |
1334 | EVP_PKEY *mackey = NULL; | |
1335 | EVP_MD_CTX *mctx = NULL; | |
1336 | unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE]; | |
1337 | unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE]; | |
b81bd336 MC |
1338 | unsigned char tmppsk[EVP_MAX_MD_SIZE]; |
1339 | unsigned char *early_secret, *psk; | |
17aa119e | 1340 | const char resumption_label[] = "res binder"; |
3a7c56b2 | 1341 | const char external_label[] = "ext binder"; |
b81bd336 | 1342 | const char nonce_label[] = "resumption"; |
3a7c56b2 MC |
1343 | const char *label; |
1344 | size_t bindersize, labelsize, hashsize = EVP_MD_size(md); | |
1053a6e2 | 1345 | int ret = -1; |
add8d0e9 MC |
1346 | int usepskfored = 0; |
1347 | ||
1348 | if (external | |
1349 | && s->early_data_state == SSL_EARLY_DATA_CONNECTING | |
1350 | && s->session->ext.max_early_data == 0 | |
1351 | && sess->ext.max_early_data > 0) | |
1352 | usepskfored = 1; | |
1053a6e2 | 1353 | |
3a7c56b2 MC |
1354 | if (external) { |
1355 | label = external_label; | |
1356 | labelsize = sizeof(external_label) - 1; | |
1357 | } else { | |
1358 | label = resumption_label; | |
1359 | labelsize = sizeof(resumption_label) - 1; | |
1360 | } | |
1361 | ||
b81bd336 | 1362 | if (sess->master_key_length != hashsize) { |
635c8f77 MC |
1363 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER, |
1364 | SSL_R_BAD_PSK); | |
b81bd336 MC |
1365 | goto err; |
1366 | } | |
1367 | ||
1368 | if (external) { | |
1369 | psk = sess->master_key; | |
1370 | } else { | |
b81bd336 MC |
1371 | psk = tmppsk; |
1372 | if (!tls13_hkdf_expand(s, md, sess->master_key, | |
1373 | (const unsigned char *)nonce_label, | |
1374 | sizeof(nonce_label) - 1, sess->ext.tick_nonce, | |
1375 | sess->ext.tick_nonce_len, psk, hashsize)) { | |
635c8f77 | 1376 | /* SSLfatal() already called */ |
b81bd336 MC |
1377 | goto err; |
1378 | } | |
1379 | } | |
1380 | ||
9368f865 MC |
1381 | /* |
1382 | * Generate the early_secret. On the server side we've selected a PSK to | |
1383 | * resume with (internal or external) so we always do this. On the client | |
add8d0e9 MC |
1384 | * side we do this for a non-external (i.e. resumption) PSK or external PSK |
1385 | * that will be used for early_data so that it is in place for sending early | |
1386 | * data. For client side external PSK not being used for early_data we | |
9368f865 MC |
1387 | * generate it but store it away for later use. |
1388 | */ | |
add8d0e9 | 1389 | if (s->server || !external || usepskfored) |
9368f865 MC |
1390 | early_secret = (unsigned char *)s->early_secret; |
1391 | else | |
1392 | early_secret = (unsigned char *)sess->early_secret; | |
b81bd336 | 1393 | if (!tls13_generate_secret(s, md, NULL, psk, hashsize, early_secret)) { |
635c8f77 | 1394 | /* SSLfatal() already called */ |
1053a6e2 MC |
1395 | goto err; |
1396 | } | |
1397 | ||
1398 | /* | |
1399 | * Create the handshake hash for the binder key...the messages so far are | |
1400 | * empty! | |
1401 | */ | |
1402 | mctx = EVP_MD_CTX_new(); | |
1403 | if (mctx == NULL | |
1404 | || EVP_DigestInit_ex(mctx, md, NULL) <= 0 | |
1405 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { | |
635c8f77 MC |
1406 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER, |
1407 | ERR_R_INTERNAL_ERROR); | |
1053a6e2 MC |
1408 | goto err; |
1409 | } | |
1410 | ||
1411 | /* Generate the binder key */ | |
9368f865 | 1412 | if (!tls13_hkdf_expand(s, md, early_secret, (unsigned char *)label, |
a19ae67d | 1413 | labelsize, hash, hashsize, binderkey, hashsize)) { |
635c8f77 | 1414 | /* SSLfatal() already called */ |
1053a6e2 MC |
1415 | goto err; |
1416 | } | |
1417 | ||
1418 | /* Generate the finished key */ | |
1419 | if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) { | |
635c8f77 | 1420 | /* SSLfatal() already called */ |
1053a6e2 MC |
1421 | goto err; |
1422 | } | |
1423 | ||
aff9929b | 1424 | if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) { |
635c8f77 MC |
1425 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER, |
1426 | ERR_R_INTERNAL_ERROR); | |
aff9929b MC |
1427 | goto err; |
1428 | } | |
1429 | ||
1053a6e2 | 1430 | /* |
aff9929b MC |
1431 | * Get a hash of the ClientHello up to the start of the binders. If we are |
1432 | * following a HelloRetryRequest then this includes the hash of the first | |
1433 | * ClientHello and the HelloRetryRequest itself. | |
1053a6e2 | 1434 | */ |
fc7129dc | 1435 | if (s->hello_retry_request == SSL_HRR_PENDING) { |
aff9929b MC |
1436 | size_t hdatalen; |
1437 | void *hdata; | |
1438 | ||
1439 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); | |
1440 | if (hdatalen <= 0) { | |
635c8f77 MC |
1441 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER, |
1442 | SSL_R_BAD_HANDSHAKE_LENGTH); | |
aff9929b MC |
1443 | goto err; |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * For servers the handshake buffer data will include the second | |
1448 | * ClientHello - which we don't want - so we need to take that bit off. | |
1449 | */ | |
1450 | if (s->server) { | |
77815a02 MC |
1451 | PACKET hashprefix, msg; |
1452 | ||
1453 | /* Find how many bytes are left after the first two messages */ | |
1454 | if (!PACKET_buf_init(&hashprefix, hdata, hdatalen) | |
1455 | || !PACKET_forward(&hashprefix, 1) | |
1456 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg) | |
1457 | || !PACKET_forward(&hashprefix, 1) | |
1458 | || !PACKET_get_length_prefixed_3(&hashprefix, &msg)) { | |
635c8f77 MC |
1459 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER, |
1460 | ERR_R_INTERNAL_ERROR); | |
aff9929b MC |
1461 | goto err; |
1462 | } | |
77815a02 | 1463 | hdatalen -= PACKET_remaining(&hashprefix); |
aff9929b MC |
1464 | } |
1465 | ||
1466 | if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) { | |
635c8f77 MC |
1467 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER, |
1468 | ERR_R_INTERNAL_ERROR); | |
aff9929b MC |
1469 | goto err; |
1470 | } | |
1471 | } | |
1472 | ||
1473 | if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0 | |
1053a6e2 | 1474 | || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) { |
635c8f77 MC |
1475 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER, |
1476 | ERR_R_INTERNAL_ERROR); | |
1053a6e2 MC |
1477 | goto err; |
1478 | } | |
1479 | ||
1480 | mackey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, finishedkey, hashsize); | |
1481 | if (mackey == NULL) { | |
635c8f77 MC |
1482 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER, |
1483 | ERR_R_INTERNAL_ERROR); | |
1053a6e2 MC |
1484 | goto err; |
1485 | } | |
1486 | ||
1487 | if (!sign) | |
1488 | binderout = tmpbinder; | |
1489 | ||
1490 | bindersize = hashsize; | |
1491 | if (EVP_DigestSignInit(mctx, NULL, md, NULL, mackey) <= 0 | |
1492 | || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0 | |
1493 | || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0 | |
1494 | || bindersize != hashsize) { | |
635c8f77 MC |
1495 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PSK_DO_BINDER, |
1496 | ERR_R_INTERNAL_ERROR); | |
1053a6e2 MC |
1497 | goto err; |
1498 | } | |
1499 | ||
1500 | if (sign) { | |
1501 | ret = 1; | |
1502 | } else { | |
1503 | /* HMAC keys can't do EVP_DigestVerify* - use CRYPTO_memcmp instead */ | |
1504 | ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0); | |
635c8f77 MC |
1505 | if (!ret) |
1506 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PSK_DO_BINDER, | |
1507 | SSL_R_BINDER_DOES_NOT_VERIFY); | |
1053a6e2 MC |
1508 | } |
1509 | ||
1510 | err: | |
1511 | OPENSSL_cleanse(binderkey, sizeof(binderkey)); | |
1512 | OPENSSL_cleanse(finishedkey, sizeof(finishedkey)); | |
1513 | EVP_PKEY_free(mackey); | |
1514 | EVP_MD_CTX_free(mctx); | |
1515 | ||
1516 | return ret; | |
1517 | } | |
38df5a45 | 1518 | |
f63a17d6 | 1519 | static int final_early_data(SSL *s, unsigned int context, int sent) |
38df5a45 | 1520 | { |
4be3a7c7 MC |
1521 | if (!sent) |
1522 | return 1; | |
1523 | ||
1524 | if (!s->server) { | |
1525 | if (context == SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | |
1526 | && sent | |
1527 | && !s->ext.early_data_ok) { | |
1528 | /* | |
1529 | * If we get here then the server accepted our early_data but we | |
1530 | * later realised that it shouldn't have done (e.g. inconsistent | |
1531 | * ALPN) | |
1532 | */ | |
f63a17d6 MC |
1533 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_FINAL_EARLY_DATA, |
1534 | SSL_R_BAD_EARLY_DATA); | |
4be3a7c7 MC |
1535 | return 0; |
1536 | } | |
1537 | ||
38df5a45 | 1538 | return 1; |
4be3a7c7 | 1539 | } |
38df5a45 MC |
1540 | |
1541 | if (s->max_early_data == 0 | |
1542 | || !s->hit | |
1543 | || s->session->ext.tick_identity != 0 | |
1544 | || s->early_data_state != SSL_EARLY_DATA_ACCEPTING | |
1545 | || !s->ext.early_data_ok | |
fc7129dc | 1546 | || s->hello_retry_request != SSL_HRR_NONE) { |
38df5a45 MC |
1547 | s->ext.early_data = SSL_EARLY_DATA_REJECTED; |
1548 | } else { | |
1549 | s->ext.early_data = SSL_EARLY_DATA_ACCEPTED; | |
1550 | ||
1551 | if (!tls13_change_cipher_state(s, | |
1552 | SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_SERVER_READ)) { | |
f63a17d6 | 1553 | /* SSLfatal() already called */ |
38df5a45 MC |
1554 | return 0; |
1555 | } | |
1556 | } | |
1557 | ||
1558 | return 1; | |
1559 | } | |
cf72c757 | 1560 | |
f63a17d6 | 1561 | static int final_maxfragmentlen(SSL *s, unsigned int context, int sent) |
cf72c757 F |
1562 | { |
1563 | /* | |
1564 | * Session resumption on server-side with MFL extension active | |
1565 | * BUT MFL extension packet was not resent (i.e. sent == 0) | |
1566 | */ | |
f63a17d6 | 1567 | if (s->server && s->hit && USE_MAX_FRAGMENT_LENGTH_EXT(s->session) |
cf72c757 | 1568 | && !sent ) { |
f63a17d6 MC |
1569 | SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_F_FINAL_MAXFRAGMENTLEN, |
1570 | SSL_R_BAD_EXTENSION); | |
cf72c757 F |
1571 | return 0; |
1572 | } | |
1573 | ||
1574 | /* Current SSL buffer is lower than requested MFL */ | |
f63a17d6 MC |
1575 | if (s->session && USE_MAX_FRAGMENT_LENGTH_EXT(s->session) |
1576 | && s->max_send_fragment < GET_MAX_FRAGMENT_LENGTH(s->session)) | |
cf72c757 | 1577 | /* trigger a larger buffer reallocation */ |
f63a17d6 MC |
1578 | if (!ssl3_setup_buffers(s)) { |
1579 | /* SSLfatal() already called */ | |
cf72c757 | 1580 | return 0; |
f63a17d6 | 1581 | } |
cf72c757 F |
1582 | |
1583 | return 1; | |
1584 | } |